<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <form action="index.html">
        用户名：<input type="text" name="user"><br>
        性别：<input type="radio" name="sex" value="男" id="">男
        <input type="radio" name="sex" value="女" id="">女
        <input type="radio" name="sex" value="保密" id="">保密<br>
        年龄：<input type="text" name="age"><br>

        <input type="submit" value="提交">
    </form>


</body>
<script>

</script>

</html>